Current–voltage characteristics of Nb–carbon–Nb junctions

We report on properties of Nb(/Ti)–carbon–(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperatur...

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Datum:	2014
Hauptverfasser:	Nevirkovets, I.P., Shafranjuk, S.E., Chernyashevskyy, O., Masilamani, N., Ketterson, J.B.
Format:	Artikel
Sprache:	English
Veröffentlicht:	Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2014
Schriftenreihe:	Физика низких температур
Schlagworte:	Свеpхпpоводимость, в том числе высокотемпеpатуpная
Online Zugang:	http://dspace.nbuv.gov.ua/handle/123456789/119426
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Назва журналу:	Digital Library of Periodicals of National Academy of Sciences of Ukraine
Zitieren:	Current–voltage characteristics of Nb–carbon–Nb junctions / I.P. Nevirkovets, S.E. Shafranjuk, O. Chernyashevskyy, N. Masilamani, J.B. Ketterson // Физика низких температур. — 2014. — Т. 40, № 3. — С. 250-258. — Бібліогр.: 18 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine

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spelling	irk-123456789-1194262017-06-07T03:04:35Z Current–voltage characteristics of Nb–carbon–Nb junctions Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. Свеpхпpоводимость, в том числе высокотемпеpатуpная We report on properties of Nb(/Ti)–carbon–(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperature of Nb, and overall metallic conductivity, in spite of a high-junctions resistance. Since the conductivity of graphite along the planes is essentially two-dimensional (2D), we use a theoretical model developed for metal/graphene junctions for interpretation of the results. The model involves two very different graphene “access” lengths. The shorter length characterizes ordinary tunneling between the three-dimensional Nb(/Ti) electrode and 2D graphene, while the second, much longer length, is associated with the Andreev reflections (AR) inside the junction and involves also “reflectionless” AR processes. The relevant transmission factors are small in the first case and much larger in the second, which explains the apparent contradiction of the observed behaviors 2014 Article Current–voltage characteristics of Nb–carbon–Nb junctions / I.P. Nevirkovets, S.E. Shafranjuk, O. Chernyashevskyy, N. Masilamani, J.B. Ketterson // Физика низких температур. — 2014. — Т. 40, № 3. — С. 250-258. — Бібліогр.: 18 назв. — англ. 0132-6414 PACS 72.80.Vp, 74.45.+c, 74.50.+r, 74.78.Na http://dspace.nbuv.gov.ua/handle/123456789/119426 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
institution	Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection	DSpace DC
language	English
topic	Свеpхпpоводимость, в том числе высокотемпеpатуpная Свеpхпpоводимость, в том числе высокотемпеpатуpная
spellingShingle	Свеpхпpоводимость, в том числе высокотемпеpатуpная Свеpхпpоводимость, в том числе высокотемпеpатуpная Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. Current–voltage characteristics of Nb–carbon–Nb junctions Физика низких температур
description	We report on properties of Nb(/Ti)–carbon–(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperature of Nb, and overall metallic conductivity, in spite of a high-junctions resistance. Since the conductivity of graphite along the planes is essentially two-dimensional (2D), we use a theoretical model developed for metal/graphene junctions for interpretation of the results. The model involves two very different graphene “access” lengths. The shorter length characterizes ordinary tunneling between the three-dimensional Nb(/Ti) electrode and 2D graphene, while the second, much longer length, is associated with the Andreev reflections (AR) inside the junction and involves also “reflectionless” AR processes. The relevant transmission factors are small in the first case and much larger in the second, which explains the apparent contradiction of the observed behaviors
format	Article
author	Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B.
author_facet	Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B.
author_sort	Nevirkovets, I.P.
title	Current–voltage characteristics of Nb–carbon–Nb junctions
title_short	Current–voltage characteristics of Nb–carbon–Nb junctions
title_full	Current–voltage characteristics of Nb–carbon–Nb junctions
title_fullStr	Current–voltage characteristics of Nb–carbon–Nb junctions
title_full_unstemmed	Current–voltage characteristics of Nb–carbon–Nb junctions
title_sort	current–voltage characteristics of nb–carbon–nb junctions
publisher	Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate	2014
topic_facet	Свеpхпpоводимость, в том числе высокотемпеpатуpная
url	http://dspace.nbuv.gov.ua/handle/123456789/119426
citation_txt	Current–voltage characteristics of Nb–carbon–Nb junctions / I.P. Nevirkovets, S.E. Shafranjuk, O. Chernyashevskyy, N. Masilamani, J.B. Ketterson // Физика низких температур. — 2014. — Т. 40, № 3. — С. 250-258. — Бібліогр.: 18 назв. — англ.
series	Физика низких температур
work_keys_str_mv	AT nevirkovetsip currentvoltagecharacteristicsofnbcarbonnbjunctions AT shafranjukse currentvoltagecharacteristicsofnbcarbonnbjunctions AT chernyashevskyyo currentvoltagecharacteristicsofnbcarbonnbjunctions AT masilamanin currentvoltagecharacteristicsofnbcarbonnbjunctions AT kettersonjb currentvoltagecharacteristicsofnbcarbonnbjunctions
first_indexed	2025-07-08T15:51:11Z
last_indexed	2025-07-08T15:51:11Z
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Current–voltage characteristics of Nb–carbon–Nb junctions

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